Larry, I mis-spoke (Notching the piston for power)

[pb3vr6 at yahoo.com (Tonee Northam)]

I have to agree with Lars, You would need smooth air flow over the wings of an aircraft otherwise it would create drag and affect the lift on the aircraft. All aircraft have some kind of damage on them, the more dimples on the fuselage the harder it is to control the flight.
 
But again we're dealing with something completely different than an airplane. VW's are pennies compared to planes.
 
Lars, Rime Ice?
 
Tonee

Lars Bruchmann <pilotlars@yahoo.com> wrote:
i have never heard of hail-damaged aircraft flying
faster, except maybe for the pilots trying to get the
aircraft to the ground before it is destroyed
completely. modern aircraft have super-critical wing
and fuselage shapes, the boundry layer is extremely
close to the surface. dimples would not help. 
the dimples in a golf ball create an 'artificial
boundry layer' which lets the ball fly farther. 
aircraft have VGs (vortex generaters), strakes and
fences on wing surfaces to do the same thing. 
a dirty aircraft will not fly as fast, since the dirt
actually raises the boundry layer, and creates drag. 
a wet aircraft will not fly as fast either. ice is
the worst, there is a type of ice that forms, which is
kinda dimpled, and it is really bad news. so, as far
as i'm concerned, dimples are bad for aircraft. but
they could be great for indian cars! :-) 
--- David Utley wrote:

> 
> 
> -----Original Message-----
> From: Larry Fry [mailto:rocco16@sbcglobal.net]
> Sent: Monday, September 13, 2004 9:21 PM
> To: fahrvegnugen@cox.net; scirocco-l@scirocco.org
> Subject: Re: Re: Larry, I mis-spoke (Notching the
> piston for power)
> 
> Why do we care how fast the intake air travels
> "across the piston"? Once
> it's inside the combustion chamber, it's a moot
> point, since the old-tech
> design of our engines is not of the 'high-swirl'
> type anyway.
> As usual, I'm a bit skeptical of stuff like
> this....but, when I hear of
> Roush, or Yates, or Lingenfelter dimpling their
> pistons I will reverse my
> postion.
> :)
> Larry
> 
> Larry,
> They would have, had they been doing NASCAR back
> in the eighties. You
> know, like when our cars were made? Besides, the
> argument that our cars are
> too old-tech a design to benefit seems weak as well.
> Megasquirt is about as
> new as it gets, and I think that all here that have
> experience with it would
> argue that it is VERY beneficial... Besides, yours
> is a 16V, yes? It is
> high enough a compression to benefit...
> It seems our arguments as of late seem to be more
> about logic and sophistry,
> rather than engineering... What's up? :)
> 
> David
> > What I am suggesting is putting dimples in the
> piston face, not the
> perimeter... Air at speed does not do well with 90
> degree, much less 180
> degree changes of direction. These dimples, or
> pockets of air, create a
> cushion of air that acts as a buffer. As the air
> travels over the surface
> of something, the air is slowed by the difference in
> speed of the two. The
> pockets acts a buffers in this regard, allowing the
> air to travel more
> quickly across the surface.
> >
> > I tried to find something via Google, about
> jetliners with hail damage
> actually flying faster, but could turn up nothing...
> You have seen the
> commercial for Lexus, haven't you? I might find
> more if I looked at golf
> ball history, I don't know... What I do know is
> that this works... :-)
> >
> > Cheers,
> > David
> 
> 
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> Scirocco-l@scirocco.org
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> 




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